Lewis s



UNITED STATES PATENT OFFICE.

LEWIS S. GHICHESTER, OF JERSEY CITY, JERSEY.

APPARATUS FOR PULVERIZING GRAIN, ORES, 86C.

SPECIFICATION fOrmng part f Letters Patent N0. 240,660, dated. April 26, 1881. Application inea ootober 11, 1880. (No model.)

To all whom it may concern Be it known that I, LEWIS S. CHIoHEsTER, of Jersey City, in the county of Hudson and State of New Jersey, have invented an Im! provementin Apparatus for Pulverizin g Grain, Ores, and other Fran gible Substances, of which the following is a specification. In an application for a patentheretofore made by me an apparatusfor and process of pulver- 1o izin g grain or other frangible substances is described and shown. In the apparatus therein set forth an annular air-space surrounds the circular tube, through which the grain or other substance to be pulverized is drawn.

In practice I have discovered that the issuing blast of air is liable to impart to the grain or other frangible material unequal velocities, and that the portions of the grain that are near the center of the supply-tube do not receive the samevelocity as those that are on the outside, and hence rst come into contact with the annular blast of air.

My present invention relates to an improvement in the nozzles or mouths through which the grain or material to be pulverized passes to the air-blast in order that al1 portions may receive the same velocity, and hence strike with the same impact and be uniformly shattered againstthe target or anvil. I make use of an orifice or mouth for the issuing grain that is wider in one direction than in the other, in order that a thin layer or stratum of grain may be acted upon by the issuing blast and receive a uniform speed of movement.

In the drawings, Figure 1 is a vertical longitudinal section of the apparatus; and Fig. 2 is a cross-section at the line x x, Fig. l, of the orifices or openings for the grain and air respectively.

The chamber a contains atmospheric air under a heavy compresson-of about three hun# dred pounds, more or less, to the inch-and from that the air passes out of the jet mouth -or orifice b.

the concussion against the anvil j' may be uniform, andvhence each grain or particle of ore or other substance will receive the same shattering effect from the impact against the stationary target or anvil.

In an application made by me, and hereinbefore referred to, the method of treating frangible substances by hurling the same against a fixed surface by the action of an issuing current of compressedrair is set forth. I therefore do not herein lay claim to any device or method therein set forth.

I claim as my invention- In an apparatus for shattering grain or other frangible substances, the tubular con veyer having at the end an orifice that is long and narrow, in combination with a chamber for c011- taining air under a high pressure, and a jetmouth for the issuing current of air adjacent to the end of the tubular conveyer, and a stationary anvil, substantially as set forth, whereby all the particles of mattervto be pulverized receive the same, or nearly the same, velocity, as set forth.

Signed by me this 8th day of October, A. D. 1880.

LEWIS S. OHICHESTER.

Witnesses EDWARD F. EivnyroNs, BENJ. F. HoE'rH. 

